What is the value of \( (5 i)^{2} \) ?
Answer
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Answer
\( -25+0i \)
Steps
Step 1 ：\( (5i)^{2}=a+bi \)
Step 2 ：\( a=5^2*(-1)= -25 \)
Step 3 ：\( b=0 \)
Step 4 ：\( -25+0i \)
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